Abstract: A method of reconstructing phase trajectories by means of the time series data of ionosphere is given in iLls paper.It is found that the phase locus can perfectly characterize the complicated behavib:tirs if the patamdters.In the end of the paper.a phase space similarity model and a regression model fad the parameter's prediction is suggested according to the features of the phase orbit.Using the f₀F₂ and M(3000)F₂ data of Haikou(20°2'N,102°20'E) to these models,the satifactory results predicted by them are shown.